Williamson Dam is an earth dam located in Meade County, South Dakota, built in 1984. It carries a Low hazard potential classification.
Dam profile
NID height · 16 ft16 ft tall and 460 ft long. Height is drawn to scale against a two-story house, about 25 ft; the profile is a generic embankment section and the water level is illustrative.
About Williamson Dam
The primary purpose of Williamson Dam is fire protection, stock, or small fish pond. The dam maintains a small impoundment used for fire suppression, livestock watering, or as a fish pond. The dam is owned by Marrs Ranch, LLC (private). It impounds the Nine Mile Creek.
The dam stands 16 feet tall and stretches 460 feet across, creates a reservoir covering 23 acres, has a maximum storage capacity of 220 acre-feet, and collects water from a drainage area of 30 square miles. Completed in 1984, the structure is 42 years old.
This dam has a low hazard potential classification, meaning that failure would cause minimal damage, limited primarily to the dam owner's property, with no expected loss of life.
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Location
| State | South Dakota |
| County | Meade |
| Nearest City | None |
| River/Stream | Nine Mile Creek |
| Coordinates | 44.58666, -103.29166 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 16 ft |
| Dam Height | 16 ft |
| Dam Length | 460 ft |
| Year Completed | 1984 (42 years old) |
Storage & Hydraulics
| NID Storage | 220 acre-ft |
| Max Storage | 220 acre-ft |
| Normal Storage | 110 acre-ft |
| Surface Area | 23 acres |
| Drainage Area | 30 sq mi |
| Max Discharge | 20,000 cfs |
Ownership & Safety
| Purpose | Fire Protection, Stock, Or Small Fish Pond |
| Owner | Marrs Ranch, LLC |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | SD02348 |
| Federal ID | SD02348 |
| More Info | State Dam Safety Program |